Here is a screenshot of GPU-Z, take a look at GPU Core Clock and GPU Load.

enter image description here

I think this might have something to do with recent windows update, but I checked the update history, there's nothing relates to GPU. I didn't update my GPU driver recently.

Now I can't even watch a video in fullscreen without lag.

My GPU is HD4400, I'm running Win8.1 x64.


My computer some how managed to fix itself today, I didn't do anything, not even a reboot. Now it's always 1100 MHz when plugged in.

  • What is your question?
    – DavidPostill
    Feb 14, 2015 at 23:13
  • @DavidPostill The question is of course how to get rid of this weird behavior.
    – JayXon
    Feb 14, 2015 at 23:15
  • I have no idea why I thought you were asking about a Nvidia card. I don't see any odd behavior. What driver version are you using? Intel recently released an update that improves performance.
    – Ramhound
    Feb 14, 2015 at 23:35
  • @Ramhound It's, I know it's not the latest from intel, but I can't install any driver downloaded from intel, the error message tells me that I have to get it from the computer manufacture. And 3958 is the latest version I can get from Lenovo. I'm using Thinkpad X1 Carbon 2014.
    – JayXon
    Feb 15, 2015 at 0:11
  • What processor do you have that reason doesn't make sense every Intel 4000HD+ supports the generic drivers, your problems, are a driver problem
    – Ramhound
    Feb 15, 2015 at 0:20


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